Progetto-verifica delle armature di confinamento negli elementi strutturali in c.a.

The concrete confinement has been studied by the authors on analytical basis. Their theory concerns stress distribution along longitudinal and transversal reinforcement and within the confined core. It respects both the forces equilibrium and the strain compatibility between hoops and concrete core. An analytical model is obtained based on the following parameters: concrete strength, longitudinal reinforcement diameter and distribution, transverse reinforcement diameter, spacing and shape, constitutive law of transverse steel. A parametric analysis, based on geometry and material properties, has been performed in order to choose the most appropriate materials and reinforcement arrangement for confinement and ductile behaviour of sections. The proposed method of analysis aim at designing building details, based not only on empirical data but also on analytic approach. The capability of the proposed model to describe analytically concrete-steel interaction allows a good prediction of section ductility